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Oracle Linux 6 Advanced System Administration

Question No: 11

Examine the dtrace command. dtrace -q -n syscall:::

Which two statements are true?

  1. The command produces minimal output, but this includes the CPU on which the probe fires, theprobe ID, and the probe name.

  2. Thedtracecommand matches with all probes in the syscall provider.

  3. The-qoption is invalid when not used with an explicit action, as in this case.

  4. The probe name specification is incorrect and does not match with any probes. This produces an “invalid probe specifier syscall:::” error message.

  5. The command produces no output.

Answer: D,E

Question No: 12

Which two commands can be used to find the cgroup to which a given process withPIDbelongs?

  1. cgget -a | grep PID

  2. ps -o cgroup | grep PID

  3. cat /proc/PID/cgroup

  4. lscgroup | grep PID

Answer: B,C

Reference:https://access.redhat.com/documentation/en- US/Red_Hat_Enterprise_Linux/6/html-single/Resource_Management_Guide/

Question No: 13

Consider thedevice-mapper-multipathpackage and configuration. Which statement is true?

  1. /etc/multipath.confis created by the package installation process.

  2. /etc/multipath.confmust be created after installation by an administrator by copying from

    /usr/share/doc/device-mapper-multipath-lt;versiongt;/.

  3. mpathconfcan modify the operating behavior of multipathing and persistent changes to the configuration file.

  4. Themultipathcommand can modify themultipathservice run-level configuration and persistent changes to the configuration file.

Answer: D

Question No: 14

Examine the UserDir directives in this extract from/etc/httpd/conf/httpd.conf:

lt;Ifmodule mod_userdir.cgt;

UserDir enabled user1 UserDir disabled user1 UserDir public_html

lt;/ifModulegt;

The web server URL ishttp://host01.

A website exists in the user’s directory/home/user1/public_html. A user attempts to accessuser1’s webpages by using the URL: http://host01/~user1

Which statement describes the outcome?

  1. The occurrence ofuser1in the list of disabled users causes anaccess deniederror to the website contained inuser1’spublic_htmlsubdirectory, overridding theenableddirective.

  2. The occurrence ofuser1in the list of enabled users allows access to the website contained inuser1’spublic_htmlsubdirectory, overridding thedisableddirective.

  3. The configuration produces an error upon web server startup, because theenabledanddisableddirectives conflict.

  4. Access is granted because theUserDir public_htmldirective applies default access to all local users on the system, overriding theenabledordisableddirective.

    Answer: B

    Question No: 15

    Examine the current SELinux status:

    # sestatus

    SELinux status: enabled SELinuxfs mount:

    /selinux Current mode:

    enforcing

    Mode from config file: permissive

    Policy version: 26

    Police from config file: targeted

    You have to meet these requirements:

    1. Network services must run in a confined domain.

    2. Theguestuser must be confined.

    3. The guest user must not be allowed from using the su command.

    4. Access to filesand directories must be granted based only of the SELinux contexts.

    5. The SELinux configuration must be persistent across system restarts.

    6. Users must be able to publish private HTML content. You issued these commands:

      # setenforce enforcing

      # semanage login -d -s guest_u guest

      # setsebool -P httpd_enabled_homedirs on Which requirements do you meet?

      A. 1, 2, 3, 6

      B. 1, 2, 3, 4, 6

      C. 1, 2, 3, 4, 5, 6

      D. 1, 2, 3, 5, 6

      E. 2, 3, 4, 5, 6

      F. 1, 6

      Answer: B

      Question No: 16

      After settings up encryption for/dev/sdd1, you notice that the file system is not mounted during system startup.

      You suspect a configuration error in/etc/crypttab:

      # cat /etc/crypttab

      # mapping device password options sdd1

      /dev/sdd1 TopSecret

      Assume that/etc/fstabis correct. Identify the reason why the file system is not mounted after system startup.

      1. Theoptionfield cannot be empty.

      2. Thepasswordfield must contain the encrypted version of “TopSecret”.

      3. Thepasswordfield must contain the file name of a file containing the correct encryption password.

      4. /etc/crypttabis group readable, world readable, or both.

      5. “TopSecret” is not the correct encryption password.

Answer: A

Question No: 17

Which three statements are true about the architecture and capabilities provided bySAMBAwhen installed on an Oracle Linux server?

  1. The Oracle Linux server may act as aSAMBAserver.

  2. Printers on the Oracle Linux system may be shared with Windows clients.

  3. SAMBAusesUDPto communicate with Windows servers.

  4. Printers on a Windows system may not be shared with oracle Linux clients.

  5. The Oracle Linux Server may act as aSAMBAclient.

Answer: B,C,E

Question No: 18

Which single statement is true for creating a labeled filesystem in RAID-1 on devices

/dev/sdc and /dev/sdd?

  1. mkfs -t btrfs -d raid1 /dev/sdc /dev/sdd

  2. mkfs.btrfs -d raid1 -L Btrfs /dev/sdc /dev/sdd

  3. mkfs.btrfs -r raid1 -L Btrfs /dev/sdc /dev/sdd

  4. mkfs.btrfs -L Btrfs /dev/sdc /dev/sdd

Answer: B

Reference:https://www.howtoforge.com/a-beginners-guide-to-btrfs

Question No: 19

Which two statements are true about SELinux in enforcing mode?

  1. Access to object is based solely on user identity and ownership.

  2. Discretionary Access Control is ignored.

  3. Mandatory Access Control is checked before Discretionary Access Control.

  4. Discretionary Access Control is checked before Mandatory Access Control.

  5. Access is denied unless permitted by SELinux.

  6. Access is permitted unless denied by SELinux.

Answer: D,E

Reference:http://docs.oracle.com/cd/E37670_01/E36387/html/ol_selinux_sec.html

Question No: 20

Which two statements are true about building binary RPMs usingrpmbuild?

  1. Building a source RPM always produces exactly one binary RPM.

  2. Using customer-complied binary RPMs is not supported by Oracle.

  3. Only theROOTuser can create binary RPMs.

  4. Only theROOTuser can install source RPMs.

  5. A binary RPM for a given hardware platform can be built on another hardware platform.

  6. Building a binary RPM will always generate a new source RPM.

Answer: B,C

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